FTIR studies on the selective oxidation and combustion oflight hydrocarbons at metal oxide surfaces Part3.—Comparison of the oxidation ofC3 organic compounds over Co3O4,MgCr2O4 and CuO
1997
Oxidation of the C
3
organic compounds propane, propene,
acrolein, propan-2-ol and acetone has been investigated over three
transition-metal oxide catalysts, Co
3
O
4
,
MgCr
2
O
4
and CuO, in a flow reactor and using
FTIR spectroscopy to study the adsorbed species.
Co
3
O
4
and MgCr
2
O
4
are very
active in propane and propene catalytic combustion. FTIR studies
suggest that adsorbed isopropoxide species and adsorbed acetone and
acetates are intermediates in propane oxidation while adsorbed
acrolein and acrylates are intermediates in propene oxidation. Flow
reactor studies support these hypotheses. It is suggested that the
reaction rates in propane and propene total oxidation can be
influenced, at low temperature, by the rate of oxidation of adsorbed
acetate and acrylate intermediates, respectively.
Co
3
O
4
and MgCr
2
O
4
are also
active and quite selective catalysts for the oxy-dehydrogenation of
propan-2-ol to acetone at low conversion, suggesting that the same
oxygen species are involved in total and partial oxidation of organic
compounds. CuO, as such, is not active in the adsorption and oxidation
of C
3
hydrocarbons and oxygenates, at low temperature. At
higher temperatures the reactants reduce the catalyst and catalytic
activity starts. The oxidation state of the CuO
x
catalyst can be evaluated by IR studying the transmittance of the
radiation upon different treatments.
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